Reducing Peak-To-Average Power Ratio (papr) Using Peak Suppression Information Messages

1. A method of wireless communication performed by a wireless communication device, the method comprising: obtaining a plurality of data symbols to be transmitted to a receiving device; applying an inverse fast Fourier transform (IFFT) to the plurality of data symbols to produce a time-domain data signal; detecting one or more peaks associated with the data signal, each of the one or more peaks representing a respective sample of the data signal having an amplitude that exceeds a threshold amplitude level; generating peak suppression information representing the amplitude, a phase, and a position in the data signal of each of the samples associated with the one or more peaks; compressing the peak suppression information; adjusting the data signal by reducing the amplitudes of the samples associated with the one or more peaks; and transmitting the adjusted data signal and the compressed peak suppression information, over a wireless channel, to the receiving device.

2. The method of claim 1 , wherein the compressed peak suppression information includes only the amplitudes and the positions of the samples associated with the one or more peaks.

3. The method of claim 1 , wherein the compressing of the peak suppression information comprises: quantizing the amplitudes of the samples associated with the one or more peaks into one or more quantization levels, each of the quantization levels representing a respective range of amplitudes; and mapping the positions of the samples having the quantized amplitudes to the respective quantization levels, the compressed peak suppression information including an indication of the positions of the samples mapped to each of the quantization levels.

4. The method of claim 3 , further comprising: transmitting, to the receiving device, quantization information indicating at least one of the range of amplitudes associated with each of the quantization levels or an average amplitude of the samples associated with each of the quantization levels; and wherein the quantization information is transmitted prior to the transmission of the adjusted data signal and the compressed peak suppression information.

5. The method of claim 3 , wherein the mapping comprises determining a difference between the positions of two samples mapped to the same quantization level, the difference being representative of the positions of at least one of the two samples in the compressed peak suppression information.

6. The method of claim 1 , further comprising: transmitting, to the receiving device, capability information indicating that the wireless communication device is capable of generating the peak suppression information; and receiving, from the receiving device, capability information indicating that the receiving device is capable of interpreting the peak suppression information.

7. The method of claim 1 , further comprising: determining an average transmit power associated with the data signal; and determining the threshold amplitude level based at least in part on the average transmit power and a target peak-to-average power ratio (PAPR).

8. The method of claim 1 , wherein the adjusting comprises reducing the amplitudes of the samples associated with the one or more peaks to a first amplitude value, the first amplitude value being less than or equal to the threshold amplitude level.

9. The method of claim 1 , wherein the transmitting comprises: modulating the compressed peak suppression information to produce one or more peak suppression symbols; applying the IFFT to the one or more peak suppression symbols to produce a peak suppression signal; and mapping the adjusted data signal and the peak suppression signal to one or more orthogonal frequency-division multiplexing (OFDM) symbols of a communication subframe, wherein: the adjusted data signal and the peak suppression signal are mapped to different OFDM symbols; or the peak suppression signal and at least a portion of the adjusted data signal are mapped to different resource elements of the same OFDM symbol.

10. The method of claim 1 , further comprising: applying a precoding matrix to the plurality of data symbols; transmitting an indication of the precoding matrix to the receiving device; receiving a precoding matrix indication (PMI) from the receiving device, the PMI indicating a recommended precoding matrix; and selecting the precoding matrix based at least in part on the recommended precoding matrix indicated in the PMI.

11. The method of claim 10 , wherein: the indication of the precoding matrix is transmitted in a physical downlink control channel (PDCCH) and indicates that the precoding matrix is the same as the recommended precoding matrix; and the indication of the precoding matrix is transmitted in a medium access control (MAC)-control element (CE) or a downlink control information (DCI) message.

12. A wireless communication device comprising: at least one processor; and at least one memory communicatively coupled with the at least one processor and storing processor-readable code that, when executed by the at least one processor, causes the wireless communication device to: obtain a plurality of data symbols to be transmitted to a receiving device; apply an inverse fast Fourier transform (IFFT) to the plurality of data symbols to produce a time-domain data signal; detect one or more peaks associated with the data signal, each of the one or more peaks representing a respective sample of the data signal having an amplitude that exceeds a threshold amplitude level; generate peak suppression information representing the amplitude, a phase, and a position in the data signal of each of the samples associated with the one or more peaks; compress the peak suppression information; adjust the data signal by reducing the amplitudes of the samples associated with the one or more peaks; and transmit the adjusted data signal and the compressed peak suppression information, over a wireless channel, to the receiving device.

13. The wireless communication device of claim 12 , wherein, to compress the peak suppression information, the processor-readable code that, when executed by the at least one processor, causes the wireless communication device to: quantize the amplitudes of the samples associated with the one or more peaks into one or more quantization levels, each of the quantization levels representing a respective range of amplitudes; and map the positions of the samples having the quantized amplitudes to the respective quantization levels, the compressed peak suppression information including an indication of the positions of the samples mapped to each of the quantization levels.

14. The wireless communication device of claim 13 , wherein, to map the positions of the samples, the processor-readable code that, when executed by the at least one processor, causes the wireless communication device to determine a difference between the positions of two samples mapped to the same quantization level, the difference being representative of the positions of at least one of the two samples in the compressed peak suppression information.

15. The wireless communication device of claim 12 , wherein, to the adjusted data signal and the compressed peak suppression information, the processor-readable code that, when executed by the at least one processor, causes the wireless communication device to: modulate the compressed peak suppression information to produce one or more peak suppression symbols; apply the IFFT to the one or more peak suppression symbols to produce a peak suppression signal; and map the adjusted data signal and the peak suppression signal to one or more orthogonal frequency-division multiplexing (OFDM) symbols of a communication subframe.

16. A method of wireless communication performed by a wireless communication device, the method comprising: receiving a data signal and a peak suppression signal from a transmitting device; applying a fast Fourier transform (FFT) to the received data signal to produce a first portion of a plurality of data symbols; applying the FFT to the peak suppression signal to produce one or more peak suppression symbols; demodulating the peak suppression symbols to recover peak suppression information; recreating one or more peaks based on the peak suppression information, the one or more peaks being representative of respective samples of the data signal; generating a second portion of the plurality of data symbols based at least in part on the one or more peaks; reconstructing the plurality of data symbols by combining the first portion with the second portion; and demodulating the plurality of data symbols to recover data transmitted by the transmitting device.

17. The method of claim 16 , wherein the peak suppression information indicates an amplitude and a position, relative to the data signal, of each of the one or more peaks.

18. The method of claim 16 , wherein: the peak suppression information includes a mapping of the one or more peaks to one or more quantization levels, each of the quantization levels representing a respective range of amplitudes; and the recreating of the one or more peaks comprises determining an amplitude and a position, relative to the data signal, of each of the one or more peaks based at least in part on the mapping of the peaks to the quantization levels.

19. The method of claim 18 , wherein: the determining comprises receiving, from the transmitting device, quantization information indicating at least one of the range of amplitudes associated with each of the quantization levels or an average amplitude of the samples associated with each of the quantization levels; and the quantization information is received prior to the reception of the data signal and the peak suppression signal.

20. The method of claim 18 , wherein: the peak suppression information indicates differences between the positions of two or more peaks mapped to the same quantization level; and, the determining of the position of the one or more peaks comprises integrating the differences between the positions of two or more peaks mapped to the same quantization level.

21. The method of claim 16 , further comprising: transmitting, to the transmitting device, capability information indicating that the wireless communication device is capable of interpreting the peak suppression information; and receiving, from the transmitting device, capability information indicating that the transmitting device is capable of generating the peak suppression information.

22. The method of claim 16 , wherein the one or more peaks have amplitudes that exceed a threshold amplitude level.

23. The method of claim 22 , wherein the threshold amplitude level is based at least in part on an average transmit power and a target peak-to-average power ratio (PAPR).

24. The method of claim 16 , wherein the generating comprises applying the FFT to the one or more peaks to produce the second portion of the plurality of data symbols; and further comprising: demapping the data signal and the peak suppression signal from different OFDMA symbols of a communication subframe; or demapping the data signal and the peak suppression signal from different resource elements of the same OFDMA symbol of a communication subframe.

25. The method of claim 16 , further comprising: receiving an indication of a precoding matrix from the transmitting device; applying an inverse of the precoding matrix to the first portion of the plurality of data symbols; determining a recommended precoding matrix to be used for communications with the transmitting device; and transmitting a precoding matrix indication (PMI) to the transmitting device, the PMI indicating the recommended precoding matrix.

26. The method of claim 25 , wherein: the indication of the precoding matrix is received in a physical downlink control channel (PDCCH) and indicates that the precoding matrix is the same as the recommended precoding matrix; and the indication of the precoding matrix is received in a medium access control (MAC)-control element (CE) or a downlink control information (DCI) message.

27. A wireless communication device comprising: at least one processor; and at least one memory communicatively coupled with the at least one processor and storing processor-readable code that, when executed by the at least one processor, causes the wireless communication device to: receive a data signal and a peak suppression signal from a transmitting device; apply a fast Fourier transform (FFT) to the received data signal to produce a first portion of a plurality of data symbols; apply the FFT to the peak suppression signal to produce one or more peak suppression symbols; demodulate the peak suppression symbols to recover peak suppression information; recreate one or more peaks based on the peak suppression information, the one or more peaks being representative of respective samples of the data signal; generate a second portion of the plurality of data symbols based at least in part on the one or more peaks; reconstruct the plurality of data symbols by combining the first portion with the second portion; and demodulate the plurality of data symbols to recover data transmitted by the transmitting device.

28. The wireless communication device of claim 27 , wherein the peak suppression information includes a mapping of the one or more peaks to one or more quantization levels, each of the quantization levels representing a respective range of amplitudes.

29. The wireless communication device of claim 27 , wherein the peak suppression information indicates differences between the positions of two or more peaks mapped to the same quantization level.

30. The wireless communication device of claim 27 , wherein, to generate the second portion of the plurality of data symbols, the processor-readable code that, when executed by the at least one processor, causes the wireless communication device to apply the FFT to the one or more peaks to produce the second portion of the plurality of data symbols.